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(No Model.) 5 Sheets-Sheetl.

J. DAWSON.

ROLLER MILL.

No. 399,186. Patented Mar. 5, 1889.

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(No Model.) -5 Sheets-Sheet 2.

J. DAWSON.

ROLLER MILL. No. 399,186. Patented Mar. 6, 1889.

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(No Model.)

J. DAWSON.

ROLLER MILL.

No. 399,186. Patented Mar. 5, 1889.

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5 Sheets-Sheet 4. J. DAWSON. ROLLER MILL (No Model.)

No. 399,186 Patented Mar. 5, 1889.

WITNESSES,

I 5 Sheets-Sheet 5 J. DAWSON.-

ROLLER MILL.

(Nu Model.)

Patented Mar. 5, 1889.

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N. PETERS. Photo-lithograph". Walhinglbfl. DC.

UNITED STATES PATENT (h rnia JAMES DAlVbON, OF HARRISBURG, PENNSYLVANIA, ASSIGXOB- OF ONE- HALF TO J OHN H. DAXVSON, OF S E PLACE.

ROLLER-MILL.

SPECIFICATION forming part of Letters Patent No. 399,186, dated March 5, 1889.

Application filed May 3, 1888. Serial No. 272,738. (No model.)

To aZ'Z whom it may concern:

Be it known that I, JAMES Dawson, a citizen of the United States, residing at Harrisbu rg, in the county of Dauphin and State of Pennsylvania, have invented a new and useful Roller-Mill, of which the following is a specification. 7

My invention relates to mills for grinding corn or other feed perfectly fine at one opera tion, in which three reductions are effected before the stock is passed through the mill, principally by a fixed main roll and three movable lesser rolls supported in swiveled bearings, so as to yielding-1y work against the periphery of the main roll, and passing the stock from roll to roll in a circuit about halfway around the main roll.

I carry out the objects of my invention by means illustrated in the accompanying drawings, in which Figure 11. is an end elevation of my mill with driver-pulley and parts of cog-gears omitted; Fig. 2, a like view of'the opposite or rightend of the same mill; Fig. 3, a top view of my mill; 4, a vertical cross-section of the same, made by avertical plane on the indicated line H H of Fig. 3; Fig. 5, a vertical section through the axis of the eccentric lever, it and other parts being shown in perspective looking toward the brokenaway casing; Fig. 6, a plan of the eccentriclever studs or sleeves; Fig. 7, a plan view of the stud-attaching bolt; Fig. 8, a longitudinal section of said stud or sleeve; Fig. 9, a longitudinal section of the eccentric-lever bar; Fig. 10, a bottom view of one of the cone spending three-way joints; Fig. 11, a longitudinal (llVlSlOll of one of the swivel-bearing levers and part of the wall of the machineframe to which it is fulcrumed.

Similar reference -letters denote similar parts in the several views.

In the vertical parallel cast-iron walls A and B, which are if *amed together by braces Q. and bolts B, centrally journaled,upon fixed horizontal bearings, the large or main roll E. On an arc of about a semicircle,

upon swiveled bearings, are journaled near the main roll a series of lesser rolls, R R R The bearings of these rolls are mounted on levers S, fulcrumed to the walls A and B. The

free ends of these several levers are pivoted to rods p q 7', respectively, which hold the lesser rolls to the main roll alike at both their ends. The three draw-rods on each side converge and cross in three-way joints, which latter, with the rods yieldingly carried therein, are themselves supported on an eccentric lever, by which they and the lesser rolls are adjusted, as will be further explained. in conjunction with the main roll, reduces the stock fi110l,l l11(30, reductions are eifected in one passage of the stock through the mill, suitable chute-boards, 5 6 7, being provided to direct the stock to the successive points of reduction, and exit-boards S, to finally discharge the material. forming a hopper beneath the rolls. All theseboards are supported on the hopper-frame .X, extended interiorly down between the walls A and B and the rolls, as shown in Fig. 3. The main shaft 0 has upon one end the pulley G and cog-wheel O, which intergears with the wheels C on the shafts k and 177, as shown in Fig. 2. Upon the other end of shaft 0 is another pulley G and a second cog-wheel C, which intermeshes with wheel 0 on shaft 7, as shown in Fig. 1. By this arrangement the oppositely-intergeared shafts, Li, Z, and an, and the rolls mounted thereon are rotated in an opposite direction to the main roll. The duplication of the pulley G is to balance the shaft andto reduce the Wear at its fixed bearings. \Vhen the small rolls are moved out of grinding contact, the said'cog-wheels (l (3 still maintain their intermeshed relation their teeth being long enough to permit sutlicient adjust ment to intermit the grinding without throwing said wheels out of gear.

The outerroll bearings X are on the levers S, which latter are fulcrumed or pivoted at their inner ends to the frames A or B by eccentric studs or wrists D each provided with the nut-form head D and adjustablysecured in place by the screw-bolt D. Byturning said head when the said bolt is slackcd the eccentric stud may be adjusted to bring the peripheries of the outer rollsin tram with;

the main roll, according to the wear of the peripheries. The free ends of said levers are clevis form, having pivoted thereto by pins As each of the series of lesser rolls,

(Z the tenons (1, into the outer ends of which are screwed the draw rods or bars 1) q r, respectively, which rods are suitably secured by the jam-nut O. The swii'el-bearings X proj ect through holes in the walls A l3, and come flush with their inner surfaces. The said drawrods converge and cross each other in the three-way joints Y Y Y which are threeway cored to admit said rods freely therethrough, and are at their bases formed with abutment-s, into which are fitted the wrists of the eccentric shifting-lever E, swiveled thereto by a set-screw, J working in a groove, E at each end of said lever E, which latter is journaled in extensions Q of the frames A B, as shown in l i The said draw rods or bars 11 q r are extensively threaded at their rear portions, and have thereon the jamrnuts J J for limiting the throw of said rods by stopping against the inner ends of the sevetal branches of the three-way joint. The exterior end of each branch of the joint is shouldered, and retains thereon the one end of a coiled spring, V, into whose outer end sets the shouldered end of a hand-nut, R, screwed upon the outer end of each of said rods, for adjusting the tension of the said springs and movable bearings as desired. The combination of the said swiveled bearings, draw-rods, three-way joints, regulating jamnuts, and springs, with the hand-nuts V, and eccentric shifting-lever E, provided with the handle E, constitute a multiple radial jack, whereby the three smaller rolls are brought up to engage the main roll for work, or are withdrawn from the same by the downward movement of the all-controlling handle E of the lever E when the grinding is to be stopped. In either alternative the said handle E' may .be clamped in place by the binding hand-bolt. t engaging the nut i through the circularlyslotted standard f, also mounted on the adjacent portion of the frame A concentrically with the axis of the lever E.

The swiveled bearings of the rolls have the capsplates bolted thereto at I) reversibly, that the oil-pockets formed thereon may be right side up for containing the lubricant, whether the said bearings are pivoted at their lower or at their upper ends, as shown in Figs. 1 and 3.

In the hopper-receptacle X is mounted the feed device, consisting of the bar f, transversely and horizontally supported in bearing-plates N, attached to the exterior of the hopper-walls. Journaled on said bar is the shoe P provided with the extension or handle P arranged to have contact by the action of gravity with the under side of the projections of a tappet-wheel, lViwhich is rotated upon its supporting-shaft which latter is j ournaled in the plates S on the hopper-walls. Said shaft IV has thereon the pulley P and it is driven from a pulley on the shaft 7t by the belt ll. Said shoe is rocked upon the axle fand delivers the corn or other feed over its end, as indicated by the arrow. Portions of the hopper-bottom 3 i and converged portions (not shown) deposit the feed upon said shoe P and a slide, IV, )rovided with the knob IV, may be slid down upon the shoe and shut off the feed entirely when required. for change of stock.

The rolls may be smooth or corrugated. They are preferably out spirally and finer in the order as follows: main roll R coarse, rolls R R finer, and the finishing-roll R finest, so that one course of stock through the mill produces finished stock or needs no further reduction.

I claim- 1. In a roller-mill, the combination of the main roll journaled in fixed bearings in the center of the frame, three smaller adjustable rolls rotating in the opposite direction to the main roll, levers provided with bearings supporting said lesser rolls, eccentric studs mounted on the frame and each supporting one end of said levers, three-way union-joints, each provided with an abutment, rods connecting said joints with one end of each of the said levers, respectively, said rods being screw-threaded at their ends and each provided with a spiral spring and a hand-nut, and an eccentric bar journaled in bearings in the frame, and having its ends swiveled in the abutments of the three-way joints, substantially as described.

2. In a roller-mill, the combination of the main roll journaled centrally in the frame in fixed bearing, and having upon its shaft the opposite similar pulleys, G, and gear-wheels C, three smaller rolls having bearings on levers S, supporting said bearings, said rolls having their shafts provided with gear-wheels C, intergeared constantly with said gear-wheels on main-roll shaft, eccentricstuds D adjustably bolted on the machine-frame and supporting said levers as pivots at their inner ends, threeavay joints Y Y Y provided with abutments M, rods 19 q 'r, pivoted to the levers, respectively, on the inner ends, and passing through the three-way union-joints at their outer ends, so as to bring the lesser rolls into grinding contact with the main roll, the spiral springs'V and hand-nuts B, one on each of said rods, and the eccentric bar E, journaled in fixed bearings on the frame, and swiveled at its ends in the abutment-s M on both said three-way joints, substantially as and for the purposes described.

3. In a roller-mill, the combination of the main roll fixedly journaled centrally in the frame, and having on both ends of its shafta driving-pulley, G, and a gear-wheel, 0, three smaller rolls having bearings on movable levers supporting said bearings, said rolls having their extended shafts provided oppositely with gear-wheels O, intergeared with the corresponding gear-wheels on the main-roll shaft, the eccentric studs D supporting one end of said levers, respectively, and adapted to be adjusted to compensate for wear of the rolls, the three-way joints Y Y Y having abutment-s M, rods p q r, pivoted to the movable levers S,respeeiive1 at their inner ends, and abutments M on the three-Way joints, and passing through the tubular branches of the provided with the operating-handle E and 10 three-way union-joints at their outer ends, means for holding it in its adjusted position, said rods being provided with jam-nuts J substantially as described.

5 J to limit their outward movement, spii al J AMES DAYSON.

springs V and hand-nuts B, one on each of the \Yitnesses: ends of said rods exterior to said joints, and the D. C. MAURER,

THEOPHILUS WEAVER.

eccentric bar E, swiveied at its ends to the 

